Remove Valgrind trybots from default set: they have been broken for ages
Remove Valgrind trybots from default set: they have been broken for ages

They've been broken since the Linux bots were upgraded to Ubuntu
Precise.  No-one is working on fixing this at the moment.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3158
TEST=none

Review URL: https://codereview.chromium.org/76373002

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@12406 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client